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DISTRHO Plugin Framework
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ExampleColorWidget.hpp (4610B)

      1 /*
      2  * DISTRHO Plugin Framework (DPF)
      3  * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
      4  *
      5  * Permission to use, copy, modify, and/or distribute this software for any purpose with
      6  * or without fee is hereby granted, provided that the above copyright notice and this
      7  * permission notice appear in all copies.
      8  *
      9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
     10  * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
     11  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
     12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
     13  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15  */
     16 
     17 #ifndef EXAMPLE_COLOR_WIDGET_HPP_INCLUDED
     18 #define EXAMPLE_COLOR_WIDGET_HPP_INCLUDED
     19 
     20 // ------------------------------------------------------
     21 // DGL Stuff
     22 
     23 #include "../../dgl/Color.hpp"
     24 #include "../../dgl/StandaloneWindow.hpp"
     25 #include "../../dgl/SubWidget.hpp"
     26 
     27 START_NAMESPACE_DGL
     28 
     29 // ------------------------------------------------------
     30 // our widget
     31 
     32 template <class BaseWidget>
     33 class ExampleColorWidget : public BaseWidget,
     34                            public IdleCallback
     35 {
     36     char cur;
     37     bool reverse;
     38     int r, g, b;
     39 
     40     Rectangle<uint> bgFull, bgSmall;
     41 
     42 public:
     43     static constexpr const char* kExampleWidgetName = "Color";
     44 
     45     // SubWidget
     46     explicit ExampleColorWidget(Widget* const parent);
     47 
     48     // TopLevelWidget
     49     explicit ExampleColorWidget(Window& windowToMapTo);
     50 
     51     // StandaloneWindow
     52     explicit ExampleColorWidget(Application& app);
     53 
     54 protected:
     55     void idleCallback() noexcept override
     56     {
     57         switch (cur)
     58         {
     59         case 'r':
     60             if (reverse)
     61             {
     62                 if (--r == 0)
     63                   cur = 'g';
     64             }
     65             else
     66             {
     67                 if (++r == 100)
     68                     cur = 'g';
     69             }
     70             break;
     71 
     72         case 'g':
     73             if (reverse)
     74             {
     75                 if (--g == 0)
     76                   cur = 'b';
     77             }
     78             else
     79             {
     80                 if (++g == 100)
     81                   cur = 'b';
     82             }
     83             break;
     84 
     85         case 'b':
     86             if (reverse)
     87             {
     88                 if (--b == 0)
     89                 {
     90                     cur = 'r';
     91                     reverse = false;
     92                 }
     93             }
     94             else
     95             {
     96                 if (++b == 100)
     97                 {
     98                     cur = 'r';
     99                     reverse = true;
    100                 }
    101             }
    102             break;
    103         }
    104 
    105         BaseWidget::repaint();
    106     }
    107 
    108     void onDisplay() override
    109     {
    110         const GraphicsContext& context(BaseWidget::getGraphicsContext());
    111 
    112         // paint bg color (in full size)
    113         Color(r, g, b).setFor(context);
    114         bgFull.draw(context);
    115 
    116         // paint inverted color (in 2/3 size)
    117         Color(100-r, 100-g, 100-b).setFor(context);
    118         bgSmall.draw(context);
    119     }
    120 
    121     void onResize(const Widget::ResizeEvent& ev) override
    122     {
    123         const uint width  = ev.size.getWidth();
    124         const uint height = ev.size.getHeight();
    125 
    126         // full bg
    127         bgFull = Rectangle<uint>(0, 0, width, height);
    128 
    129         // small bg, centered 2/3 size
    130         bgSmall = Rectangle<uint>(width/6, height/6, width*2/3, height*2/3);
    131     }
    132 };
    133 
    134 // SubWidget
    135 template<> inline
    136 ExampleColorWidget<SubWidget>::ExampleColorWidget(Widget* const parent)
    137     : SubWidget(parent),
    138       cur('r'),
    139       reverse(false),
    140       r(0), g(0), b(0)
    141 {
    142     setSize(300, 300);
    143     parent->getApp().addIdleCallback(this);
    144 }
    145 
    146 // TopLevelWidget
    147 template<> inline
    148 ExampleColorWidget<TopLevelWidget>::ExampleColorWidget(Window& windowToMapTo)
    149     : TopLevelWidget(windowToMapTo),
    150       cur('r'),
    151       reverse(false),
    152       r(0), g(0), b(0)
    153 {
    154     setSize(300, 300);
    155     addIdleCallback(this);
    156 }
    157 
    158 // StandaloneWindow
    159 template<> inline
    160 ExampleColorWidget<StandaloneWindow>::ExampleColorWidget(Application& app)
    161     : StandaloneWindow(app),
    162       cur('r'),
    163       reverse(false),
    164       r(0), g(0), b(0)
    165 {
    166     setSize(300, 300);
    167     addIdleCallback(this);
    168     done();
    169 }
    170 
    171 typedef ExampleColorWidget<SubWidget> ExampleColorSubWidget;
    172 typedef ExampleColorWidget<TopLevelWidget> ExampleColorTopLevelWidget;
    173 typedef ExampleColorWidget<StandaloneWindow> ExampleColorStandaloneWindow;
    174 
    175 // ------------------------------------------------------
    176 
    177 END_NAMESPACE_DGL
    178 
    179 #endif // EXAMPLE_COLOR_WIDGET_HPP_INCLUDED